检查字符串是否只包含 PHP 中的 URL
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Check if a string contains nothing but an URL in PHP
提问by yan
I am wondering if this is a proper way to check, if a string contains nothing but an URL:
我想知道这是否是检查字符串是否只包含 URL 的正确方法：
if (stripos($string, 'http') == 0 && !preg_match('/\s/',$string)) {
do_something();
}
stripos() checks if the string starts with "http"
preg_match() checks if the string contains spaces
stripos() 检查字符串是否以“http”开头
preg_match() 检查字符串是否包含空格
If not so, I assume that the string is nothing but an URL - but is that assumption valid? Are there better ways to achieve this?
如果不是这样，我假设该字符串只是一个 URL - 但这种假设是否有效？有没有更好的方法来实现这一目标？
回答by John Conde
Use filter_var()
if (filter_var($string, FILTER_VALIDATE_URL)) {
// you're good
}
The filters can be even more refined. See the manualfor more on this.
回答by Winston
In PHP there is a better way to validate the URL http://www.php.net/manual/en/function.filter-var.php
在 PHP 中有一种更好的方法来验证 URL http://www.php.net/manual/en/function.filter-var.php
if(filter_var('http://example.com', FILTER_VALIDATE_URL)))
echo 'this is URL';
回答by CFP Support
To more securely validate URLs (and those 'non-ascii' ones), you can
要更安全地验证 URL（以及那些“非 ascii”），您可以
- Check with the filter (be sure to check the manualon which filter suits for your situation)
- Check to see if there are DNS records
- 检查过滤器（请务必检查适合您情况的过滤器的手册）
- 查看是否有DNS记录
$string = idn_to_ascii($URL);
if(filter_var($string, FILTER_VALIDATE_URL) && checkdnsrr($string, "A")){
// you have a valid URL
}
$string = idn_to_ascii($URL);
if(filter_var($string, FILTER_VALIDATE_URL) && checkdnsrr($string, "A")){
// you have a valid URL
}
